TREK MCP trip summary bypasses delegated OAuth read scopes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77321
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 19:17:16 UTC
Updated2026-09-25 13:17:26 UTC
DescriptionTREK is a collaborative travel planner. Prior to 3.3.0, the get_trip_summary tool in server/src/mcp/tools/trips.ts is registered for scoped OAuth MCP tokens without requiring trips:read and returns core trip summary data regardless of the delegated scopes. A token granted only an unrelated capability, such as weather:read, can receive trip metadata, member email addresses from server/src/services/tripService.ts, itinerary days, and accommodations for every trip accessible to the token's user. Cross-user trip authorization remains enforced, but the missing scope check defeats the consented least-privilege boundary and exposes trip content and third-party contact information to an MCP client that was not authorized to read it. This issue is fixed in version 3.3.0.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.001990000 probability, percentile 0.087660000 (date 2026-09-27)

Problem Types: CWE-200 | CWE-284 | CWE-862 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-284 CWE-284: Improper Access Control | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mauriceboe TREK affected < 3.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/liketrek/TREK/pull/1520 [email protected] github.com
github.com/liketrek/TREK/releases/tag/v3.3.0 [email protected] github.com
github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq [email protected] github.com
github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2 [email protected] github.com
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